In reply to Trangia:
When I worked in hospitality on the west coast, the main thing that boiled our piss was during the summer on evenings when we had music in the bar. About 7pm or so you'd get about 10 or so tourists who would come in and pull tables together, thus re-decorating the place for us, and pull them as close to where the band would be sitting as possible so they all got a good view, even if they blocked the aisles and everyone else's view. A polite request for them not to block the passage-ways would result in a stool being helpfully moved 10cm to the side. Then they would all order a soft drink each and sit and nurse it like a hand-warmer.
I wasn't even bar staff, but I would join them and the waiting staff in doing the rounds of glass collecting and deliberately hovering around tables like this looking for empty glasses. Each visit we'd keep asking them pointedly if they'd like another drink. The amateurs amongst them would have drunk up after an hour and then react surprised that we were asking them to buy another drink if they wanted to remain in the bar. The real tightwads would sit and sip a tall glass of water for a whole evening. But then, nothing like enjoying yourself and living it up when on holiday...
This was only the continental tourists, of course. The UK tourists, and especially the Glasgow away for the weekend brigade, would come in for the music and then sit or stand around the bar whooping, shouting, breaking out into song and trying to drink the bar dry.